Coronavirus (COVID-19) update: We are currently updating information following recent Queensland and Australian Government announcements. Find assistance and support for coronavirus affected businesses and industries.

Eungella satinash—red and white

Scientific name

Acmena resa (red), Syzygium wesa (white). Family: Myrtaceae

Other names

Red eungella gum; white eungella gum; watergum (both)

Description

  • Grows large in North Queensland.
  • Trunk moderately buttressed.
  • Bark is flaky on both species.

Occurrence

  • Occurs in highland areas from Proserpine to Cooktown, including the Eungella Range.

Appearance

Colour

  • Red eungella satinash (RES) heartwood is pink to red-brown.
  • White eungella satinash (WES) heartwood is pale grey to yellow-brown.
  • Sapwood is greyish yellow.

Grain

  • Generally straight, short and open.
  • Often moderately wavy.

Uses

  • Construction: structural building framing, flooring, plywood.
  • Decorative: flooring, panelling.
  • Others: turnery.

Properties

  • Density: red eungella satinash is 785kg/m3 and white eungella satinash is 755kg/m3 at 12% moisture content; about 1.3m3 of seasoned sawn timber per tonne.
  • Strength groups: red—(S4) unseasoned, (SD5) seasoned; white—S4 unseasoned, SD5 seasoned.
  • Stress grades: F7, F8, F11, F14 (unseasoned); F8, F11, F14, F17 (seasoned) when visually stress graded according to AS 2082—2000: Timber—Hardwood—Visually stress-graded for structural purposes.
  • Joint groups: red—JD2 seasoned; white—J3 unseasoned, JD2 seasoned.
  • Shrinkage to 12% MC: not available.
  • Unit shrinkage: not available.
  • Durability above-ground: Class 3 (life expectancy 7—15 years).
  • Durability in-ground: Class 3 (life expectancy 5—15 years).
  • Lyctine susceptibility: untreated sapwood susceptible to lyctid borer attack.
  • Termite resistance: not resistant.
  • Preservation: sapwood readily impregnates with preservative.
  • Seasoning: slow to dry, be careful seasoning to avoid checking.
  • Hardness: moderately hard (rated 3 on a 6-class scale) to indent and work with hand tools.
  • Machining: hard to work.
  • Fixing: no difficulties using standard fittings and fastenings.
  • Gluing: glues well.
  • Finishing: readily accepts paint, stain and polish.

Identification features

General characteristics

  • Sapwood: greyish yellow.
  • Heartwood: red-brown (RES) and yellow-brown (WES).
  • Texture: fine to medium and uniform; grain slightly interlocked.

Wood structure

  • Vessels: small to medium, very numerous, but more so in WES; solitary and short radial multiples; vessels lines not obvious; both often show whitish vessel deposits.
  • Parenchyma (soft tissue): difficulty to see under lens.
  • Rays: barely visible to the naked eye, and tends towards 2 distinct widths.

Other features

  • Burning splinter test: match-size splinter from both timbers will burn with some crackling to leave a charcoal tip and black non-adherent ash.
  • Note: both timbers differ only in colour.

Research and resources

  • Boland, DJ, Brooker, MIH, Chippendale, GM, Hall, N, Hyland, BPM, Johnston, RD, Kleinig, DA and Turner, JD 2006, Forest trees of Australia, 5th ed., CSIRO Publishing, Collingwood, Australia.
  • Bootle, K 2005, Wood in Australia: Types, properties and uses, 2nd ed., McGraw-Hill, Sydney.
  • Ilic, J 1991, CSIRO atlas of hardwoods, Crawford House Press, Bathurst, Australia.
  • Queensland Government, DAF 2018, Construction timbers in Queensland: Properties and specifications for satisfactory performance of construction timbers in Queensland. Class 1 and Class 10 buildings, Books 1 & 2, Department of Agriculture and Fisheries, Brisbane.
  • Standards Australia, 2000, AS 2082—2000: Timber—Hardwood—Visually stress-graded for structural purposes, Standards Australia International, Strathfield, NSW.